From Longman Dictionary of Contemporary Englishmarlmarl /mɑːl $ mɑːrl/ noun [uncountable] 1 soil consisting of lime and clay2 cloth which has pale threads running through another colour a jacket available in black or grey marl
Examples from the Corpus
marl• Higher slopes reveal widening seams of calcareous marl, sand and thin seams of marl, sandy-lignites and clayey-lignites.• The projecting porch with its embattled parapet is rendered with local marl and is a late sixteenth-century addition.• In addition, on some manors, the liberal application of marl made possible an extension of the area under wheat. 